Drawing-press.



PATENTED SEPT. 22, 1903.

W. KLOGKE. DRAWING PRESS.

urmm'non FILED JULY 5, 1902.

3 SHEETS-SHEET 1.

N0 MODEL.

INVENTOR:

WITNESSES:

By izomeys,

MGM KC?) NORRIS FEVERS cow PNoToumo WASHINGTON, u c.

PATBNTED SEPT. 22, 1903. w. KLOGKE.

DRAWING PRESS.

APPLICATION FILED JULY 5, 1902.

3 SHEETS,SHEET 2.

R0 MODEL.

a/mw #120 yflVENTOR By Aflbrneys,

WITNESSES:

PATENTBD SEPT. 22, 1903.

S w. KLOGKB.

DRAWING PRESS. APPLIOATIOH TILED JULY 5, 1902.

I 3y SHEETS-SHEET 3;

10 MODEL.

INVENTOR:

By Azfomys,

WITNESSES: %m [M- a' nral "iio. 739,42?)

UNITED STATES Fatented September 22, 1903 PATENT OFFICE.

WILLIAM KLOCKE, OF BROOKLYN, NEW YORK, ASSIGNOR TO w. BLISS OOMPANY, OF BROOKLYN, NEW YORK, A

VIRGINIA.

CORPORATION OF WEST DRAWING-PRESS.

sr EGIFICATION forming part Of Letters Patent No. 739,427, dated September 22,1903.

Application filed July 5, 1902.

v To a/U whom it may concern:

Be it known that 1, WILLIAM KLOCKE, a

citizen of the United States, residing in the central portion of the blank into cup shape and drawing the metal between the blankholding. surfaces. In the American type of such presses the bed or lower die is stationary and the blank-holder descends from above it, while the punch also descends from above through the blank-holdera'nd through the female die carried by the bed. In the German type of presses the upper blank 1 holding member is stationary and the bed carrying the lower blank-holding member moves up from beneath to'clamp the blank against the upper blank-holding me mb'enwhile the punch comes down from above through the blankholder and into the die to draw the blank. In both types-of press it is common to operate the movable blank-holding member by means of toggles, which move into alinement at the instant that the blank is clamped against the stationary member, and to drive the punch from a crank which makes one revolution to each drawing operation. The blank is clamped at about the beginning of the downstroke of the pun ch, is held with the requisite pressure during this stroke,'and is released immediately after the punch-operating crank passes its lower dead-center, whereupon the movable blank-holding member returns to its originalposition. it is placed on the lower member of the blankholder. For this purpose it is requisite that the lower blank-holding member be held substantially stationary for a suflicient time to enable the blank to be properly placed in position. In the American type of press, with In feeding a newblank' Serial No. 114,383. (No model.)

rally the case. In the German type of press with amovable bed the movement is soregulated that the bed" remains stationary in its lowest position during about one hundred and twenty degrees of movement of the crank. It then ascends during about sixty degrees, in which time the punch begins its descending movement, the bed reaching its upper position and clamping the blank'shortly before the punch engages the blank. ..Tl1e bed then remains stationary in the blank-holding position during about one hundred and twenty degrees, during which time the punching Operation is performed, whereupon the bed descends during about sixty degrees of movement to its original position. This invention provides an improved means for operating the movable bed or other-movable part carrying the movable member of the blank-holder. Preferably the movable bed in my improved machine is operated by crank, (which may be mounted on the main shaft or crank-shaft which operates the punch,) by which is imparted the long stroke or vertical movement necessary for directly for a prolonged dwell of the bed in its lower positionl provide means at the lower end of tralizes the effect of a portion of the vertical movement imparted by the crank. Preferably a vertically-reciprocating slide is driven by the pitman and the vertical movement imparted by it is modified to cause the bed to dwell, as desired. It is, in fact, within the invention to use such a slide operated by any other means than a crank orpitman. The modification of the reciprocatingmovement of the slide is preferably attained by means of a lost-motion connection between the .bed and the slidel The accompanying drawings illustrate 'ap paratus embodying the invention. 4

drawing-press. Fig. 2 is a front elevation thereof. Figs. 3 and 4 are side elevations of 1,. the parts being shown in different positions. Fig. 5 is a diagram illustrating the relative movements of the punch and the Figure l is a side elevation of a complete.

the lower member stationar this is natuoperating the bed, and in order to provide 8o a pitman connected to said crank, which new the lower portion of the press shown in Fig. I

: J or similar element.

lower die or bed. Fig. 6 is a transverse section of the press of Figs. 1 to 4. Figs. 7 and S are views similar to Fig. 1, showing other embodiments of the invention.

Referring to the d rawings,A designates any suitable frame, preferably upright, and consisting in the construction shown of two upright side frames connected together at top and bottom and having a stationary crosshead 13, fixed in place between them. This cross-head is vertically adjustable, as indicated. A vertically-movable slide or plunger 0 is mounted to move through the open or hollow central portionof the cross-head B. A lower cross-piece D, constituting a movable bed or platen, is mounted to move vertically between the side frames, being guided by any suit-able slideways. The cross-pieces B and D carry, respectively, the clamping members E F, which together constitute the blankholding m eans,the upper blank-holding member E being fastened beneath the cross-head B, while the lower blank-holding member F is fastened on top of the movable bed D. The punch G is fastened beneath the plunger C and works through the blank-holdin g members E F, the latter of which constitutes the female die. The vertically-movable plunger 0, with its punch G, may be moved by any mechanism known in the art or applicable to this purpose, being shown as operated by a crank on the main shaft H of the machine, the plunger being connected to the crank by a connectingrod I, adjustable in length, as usual, in order to adjust the punch up or down. This crank-drivin g mechanism imparts a regular rising-and-falling movement to the punch, as shown by the sinuous curvein Fig. 5. Ord in arily the press will be driven continuously, although it may include means for stopping the machine at the end of each revolution, so that it shall remain inactive until again started by the operator.

The bed D receives its movement, preferably, from a slide J, mounted in slideways in one side of the frame of the machine and preferably operated by being connected to the lower end of a pitman K, which is connected at its upper end to a crank-pin L,

. driven by the main shaft H of the machine.

Between the bed D and the slide J is interposed the usual compound toggle-joint mechanism, comprising toggle-links M N, the former connected to the bed and the latter to oscillating transverse shafts O, and additional toggle-links P Q, the former connected also to the shafts 0, so as to form, in fact, a crank thereon. Ordinarily the outer end of the link Q is connected directly to the slide \Vith such a mechanism the iact that some lost motion is taken up in the several joints and the fact that the movement of the slide produces only an almost imperceptible movement of the bed in the upper position of the latter are suflioient to provide the requisite dwell during the upper or blank-holding position of the bed, so

that ordinarily no modification of the crank movement is necessary to provide for this dwell. This is not the case, however, in the lower position of the bed, and in order to pro vide the desired dwell in such lower position I provide for a certain amount of lost motion between the slide and the pin R, which forms the mutual connection between the links P and Q. This lost motion is such as to cause an absolute positive dwell in the upper extreme position of the bed, as well as in its lower position. Preferably, as in Figs. 1 to 7, lost motion is provided by connecting the link Q to the slide J by means of an intermediate link S. The pin T, forming the mutual connection between the links Q and S, is guided so that during the period when the bed is to move upward or downward the pin moves directly vertically with the same effect as if it Were attached directly to the slide J; but at the lower and preferably also the upper end of its movement the pin T is free to swing outward to the positions indicated in Figs. 3 and at. The guiding of the pin T may be accomplished by means ofa rib U on the frame of the machine and a pin V on the slide J, which latter bears against the link S,and thus holds the pin outward.

In the uppermost position of the bed the toggle M N swings outward a slight distance beyond its center and maybe held rigidly in such position by arms X, Figs. 1 to 6, which swing down against rigid stops Y and prevent further outward movement of the toggle. The arm X and stop Y serve also to relieve the strain on the bearings of the shafts 0 during the drawing movement of the punch. The downward movement of the bed is limited by a spring-stop Z.

The operation of the machine described will be understood from Figs. 1 to 5. WVith the punch in its highest position, as shown in dotted lines in Fig. l, the crank-pin L has advanced sixty degrees from its lowest position and is at the point of commencing the lifting movement of the bed. The position is indicated at naught degrees in Figs. 1 and 5. As the crank-pin L moves upward it operates the slide J and the constrained pin T, as in the usual compound toggle-joint mechanism, li fting the parts to the dotted-line position of Fig. 3 when the crank-pin has moved sixty degrees. As the crank-pin L moves from the sixty degrees position to its highest position (one hundred and twenty degrees) the links Q and S are straightened out to the full-line position of Fig. 3 without causing any movement of the bed D. The same is true as the crankpin L moves downward from its one hundred and twenty degrees to its one hundred and eighty degrees position, returning the pin T again to the dotted-line position of Fig. 3. The crank-pin L then moves downward from its one hundred and eighty degrees position to its two hundred and forty degrees position, carrying with it the constrained pin T and the entire compound toggle mechanism back to IIO thestarting positionof Fig. 1. The. bed is then in, its lower position, The subsequent to theposition of Fig. 1 without movementof the bed'D. complished its work while the bed was held in its upper position and has returned to its original position. Instead of controlling the movement-of the pin T by means of the stop V on the slide and the rib U on the frame of the machine it may be controlled by a groove W, Fig. '7, shaped to guide the pin to the several positions described and indicated in Figs. 1, 3, and 4, orinstead of taking up the lost motion between the pin R and the slide by means of the two links Q and S such lost motion may be taken up by connecting the crank or toggle link P to the slide J bymeans of a slotted link Q, Fig. 8. In this construction the shaft 0 is provided with an additional crank P, which is moved down by engage: ment with the lower edge of the slide .1 and by its downward movement rocks the shaft 0 to lower the bed D. After the slide J has 'moved the crank P downward sufficiently to bring the bed to its lower position it continues its downward movement without any'movement of the bed, the pin R on the crank P sliding through the slot in the link Q to permit this lost motion. The same is true in the uppermost position of the bed. For example,

- tion connection between the crank P and the slide to cause the desired dwell in an extreme position of the shaft.

The invention has an advantage over other devices in use by reason of its-simplicity and its ready adaptability to machines already constructed. The mechanism for securing the desired movement is compact and is not subjected to any great amount of wear, as is the casein the mechanisms commonly in use. The invention is not necessarily'limited to a drawing-press of the German type, since it is applicable also to a press where the lower blank-holding member is stationary and the upper member is carried by a movable part, in which case the moving part carrying the upper member becomes the equivalent of the movable bed of the press herein described.

Though I have described with great particularity of detail apparatus embodying my The punch has meanwhile ac:v

invention, it is to be understood that the invention is not limited to the detailed con.- structions shown and described.

Various modifications in the details and in the arrangement and combination of the parts are possible to those skilled in 'theart without departing from the invention.

What I claim, therefore, is- Y 1. In a drawing-press, the. combination with a movable bed, of a crank and pitn'ian for operating it, and a togglemechanism .be'

tween said bed and the lower endof said pitman for neutralizing the eifect of a portion of the vertical movement imparted by the crank to cause the bed to dwell in its lower. position.

2. In a drawingpress, the combination with a movable bed, of a reciprocating slide for operating it, and a toggle mechanism be tween the slide and bed for modifying the vertical movement imparted by said slide to cause the bed to dwell in its lower position.

3. In a drawing -press, the combination with a movable bed, of a reciprocating slide for operating it, a compound toggle mechanism for providing a dwell in the upper position of said bed, and a connecting means between said slide and said compound toggle mechanism adapted to cause said bedto dwell in its lower position.

4. In a drawing-press, the combination with a movable bed, of a reciprocating slide for operating it, and a link connection be tween said bed and said slide adapted to permit lost motion for causing the bed to dwell in its lower position.

5. In a drawing press, the combination with a movable bed, of a reciprocating slide, an oscillatory shaft for operating said bed, a crank on said shaft, and a link connection between said slide and said crank adapted to permit lost motion to cause said bed to dwell in its lower position.

6. In a drawingpress, the combination with amovable bed, of a reciprocating slide, an oscillatory shaft for operating said bed, a crank on said shaft, a link connectedto said crank, a link connected to said slide and to said first-mentioned link, and means for guiding the point of mutual connection of said links whereby said shaft is oscillated and is caused to dwell in'it-s extreme position.

' 7. In a drawing-press, the combination with a movable bed, of a reciprocating slide,

an oscillatory shaft for operating said bed, a crank on said shaft, a link connected to said crank, a link connected to said slideand to said first-mentioned link, means forpreventing inward movement of said second link, and means for preventing outward movement of said first link in the intermediate positions of said slide and permitting such outward movement in the extreme position'thereof to cause said shaft to dwell in its extreme posi-.

with-a movable bed, of a reciprocating slide,

an oscillatory shaft for operating said bed, a crank on said shaft, a link connected to said crank, a link connected to said slide and to said first-mentioned link, a stop on said slide for preventing; inward movement of said sec- 011d link, and a rib on the frame of the press for preventing outward movement of said first link in the intermediate positions of said slide and permitting such outward movement in the extreme position thereof to cause said shaft to dwell in its extreme position.

9. In a drawing press, the combination with a movable bed of an oscillatory shaft 0 for operating said bed, a crank N on said shaft, a toggle link 'M connected to said crank and to said bed, means for oscillating said shaft to raise said bed, a stop, and an arm on said shaft adapted to bear on said stop in the uppermost position of said bed to relieve the downward pressure on the shaftbearings.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WILLIAM KLOCKE. Witnesses:

OTTO S. BEYER, FRED. II. HOGAHIE. 

